Mob justice, meanwhile, is derived from the collective feelings of whoever happens to be participating. The mob's case law is limited to whatever its participants happen to remember and care about in that moment. Its rules of evidence privilege anything that shares easily on social media and that confirms the preexisting belief system of the mob participants. That is a way of administering justice that is just as likely to target innocent people as guilty ones — especially because there's no definition of what "guilty" and "innocent" mean in the first place.

But the harmfulness of conspiracy theory arguably goes much deeper than this. It’s not just that conspiracy belief sometimes causes people to do terrible things. It’s that attachment to the conspiracy worldview violates important norms of trust and forbearance that are central to how we relate to each other and the wider world.

First, emotions organize — rather than disrupt — rational thinking. Traditionally, in the history of Western thought, the prevailing view has been that emotions are enemies of rationality and disruptive of cooperative social relations.

I find this sort of thinking to be dangerous. Once you accept the premise that a life is only worthwhile if it is truly notable and great, then you basically accept the fact that most of the human population sucks and is worthless. And ethically speaking, that is a really dark place to put yourself.